Zijin Bridge Construction Monitoring And Key Technology Research

Cable-stayed bridge is high hyperstatic structure having stringent requirements on the Linear of bridge.The change of coordinates of each node can affect the distribution of structure's internal forces. Once the Linear of bridge deviates from the design value, internal forces will deviate too.Therefore, we must strictly control the construction process of the cable-stayed bridge in order to ensure a reasonable linear of bridge. In this paper, Zijin Lishui Bridge is used for example and execute the entire monitoring of the cable-stayed bridge's construction. At the same time, based on neural network technology, express various parameters of impact the linear of cable-stayed bridge, and identificate each parameter, forecast the main beam elevation. The main contents are as follows:1. Formulate the content and program of construction monitoring elaboratly,as a means of guiding the entire process of construction reasonably and safly,2. Monitor the heat of hydration of mass concrete of the cap and the under-beam, and corresponding measures have been taken to prevent the occurrence of temperature cracking,3. In the construction of the tower ,control the stresses of foot tower in the mid-tower using the means of horizontal steel'support,4. Insure real-time identification of the concrete elastic modulus and density of main beam by BP neural network algorithm, and verify its reliability through the measured values,and forecast the follow-up construction using this algorithm,5. Formulate the close up the program and adjust the linear and the cable force of the builted bridge.